Difference between throw and throws?
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Can an object subclass another object?
Explain notifyall() method of object class ?
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Why do we need data structure in java?
What is the set interface in java programming?
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my method "abc" return array of interface "xyz" and "pqr" is abstract class implements abc and class "jkl" extends pqr My problem 1) when i call abc it retrun array xyz how can i do this hint xyz refer_xyz = new jkl(); but i can't create array. 2)I want to access method of jkl using reference of xyz??
what is optional in java 8?
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